Study On Three-Dimensional Fluorescence Spectra Of Fuel's Quality

The quality of fuels can directly affect working condition, operativecondition, and service life of engine and riding ability of automobile. However,with the increasing price of fuels, some illegal gas stations adulterate fuelsthrough various means to get huge profits. Therefore, inspecting and assuringfuel's quality is not only essential to operation of engine, but also is importantto market control on fuels.Based on analysis and integration of actuality and development trend offuel's quality measuring techniques of home and abroad, three-dimensionalfluorescence of fuels are studied, three-dimensional fluorescence spectralsubtraction method and general implementing plan are presented, and keytechniques are analyzed deeply.Based on production mechanism of fluorescence, feasibility of measuringfuel's quality by using three-dimensional fluorescence is analyzed inconsideration of composition characteristic of fuels. Using FS900 highperformance steady state fluorimeter, excitation and emission spectra ofself-confected fuel solutions are measured. Through analyzing, ranges ofexcitation wavelength and emission wavelength for three-dimensionalfluorescence analysis are selected.Using three-dimensional fluorescence spectral subtraction, impurities infuels are distinguished qualitatively and analyzed quantitatively by totalvolume integral of three-dimensional fluorescence spectral subtraction data.Relation curve of total volume integral of three-dimensional spectralsubtraction of diesel vs. adulteration concentration of solvent naphtha is obtained.According to spectral characteristic of fuel, appropriate exciting lightsource is selected, grating monochrometer with stepping motor driving isdesigned, and the light signals measured by CCD is acquired by PCI-DAS4020data acquisition card.Through theory analysis and basic experiment, we validate correctness andrationality of three-dimensional fluorescence spectral subtraction analysispresented in this paper. A highly sensitive and selective new technique meansis provided for measurement of fuel's quality.